Try finding glass paint at Ben Franklin Craft stores. It works well. You would be able to apply it into the cavity. The dial has to be cleaned thoroughly. I recommend lacquer thinner on a Q Tip, then let it dry well before applying paint (about 1/2 hour).
Terry F
:The gold will adhere better to glass due to its chemical make up.
:
:Try finding glass paint at Ben Franklin Craft stores. It works well. You would be able to apply it into the cavity. The dial has to be cleaned thoroughly. I recommend lacquer thinner on a Q Tip, then let it dry well before applying paint (about 1/2 hour).
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:Terry F
For flat glass you will have to build a silk screen (or have a very good hand...preferrably with a fountain pen....getting fountain pens to handle paint can be difficult, depending on the consistency). The only thing I would tackle would be the silk screen, or perhaps some very light touch-ups with the pen. My hand isn't at all steady.
T.